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Use this Sea & Sea Zoom Gear to control manual zooming with your Canon EF 16-35mm f/2.8L I/II USM or Tokina AT-X 107 DX Fisheye 10-17mm f/3.5-4.5 (IF) lens in a compatible lens port, which mounts onto an MDX or RDX underwater camera housing. For compatibility information, see MDX System Chart and RDX System Chart. The gear mounts onto the zoom ring of the lens and is controlled via the focus/zoom dial/knob on the housing. It is constructed from a corrosion-resistant aluminum alloy.